/Engine/Source/Runtime/Slate/Public/Widgets/SCanvas.h
Note: FILL is NOT supported.
class FSlot : public [TWidgetSlotWithAttributeSupport< FSlot >](API\Runtime\SlateCore\Layout\TWidgetSlotWithAttributeSupport), public [TAlignmentWidgetSlotMixin< FSlot >](API\Runtime\SlateCore\Layout\TAlignmentWidgetSlotMixin)